Functional dependency
<database> Given a relation R (in a relational database), attribute Y of R is functionally dependent on attribute X of R and X of R functionally determines Y of R (in symbols R.X -> R.Y) if and only if each X in R has associated with it precisely one Y in R (at any one time).
Attributes X and Y may be composite.
This is very close to a function in the mathematical sense.
| < Previous Terms | Terms Containing functional dependency | Next Terms > |
| fum Fun function functional functional database | functionality functional language functional program functional programming functional programming language |
